Production method of 5-series aluminum alloy strip

Abstract

The invention belongs to the technical field of aluminum alloy, and particularly relates to a production method of a 5-series aluminum alloy strip. The production method adopts the following technical route: casting, sawing and milling, heating, hot rough rolling, hot finish rolling, rapid cooling and bending / stamping. The hot rough rolling adopts segmented rolling and comprises 13-18 passes, the rolling speeds of the first 9-14 passes are 3-6m / s, the rolling temperature of an intermediate billet is 450-520 DEG C, and the reduction rate of each pass is greater than 30%; and the rolling speed of the last four passes is reduced to 0.1-1.5 m / s, and the rolling temperature of the intermediate billet is 430-480 DEG C. According to the production method of the 5-series aluminum alloy strip, the processes of fusion casting, sawing and milling, heating, hot rough rolling, hot finish rolling, rapid cooling and bending / stamping are adopted, high-low-speed segmented rolling is adopted in the hot rough rolling process, and crystalline grains are fully crushed to form fine crystalline grains at the front section by adopting the great machining rate; and sufficient recrystallization is ensured at an extremely low rolling speed in the rear-section pass. And the formability and strength of the material are improved through fine grain strengthening, so that the aluminum alloy material has better subsequent processability and durability.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloys, and in particular relates to a production method of a 5-series aluminum alloy strip. Background technique [0002] 5-series aluminum alloys are widely used in ship plates, automobile plates, transport tanks, tank lid pull rings, and require excellent processing performance, high Products with corrosion resistance, high fatigue strength and high weldability. The various uses of the above aluminum alloys need to first ensure the excellent formability of the material and ensure that the aluminum alloy material does not crack during the stamping and bending process. At present, there are usually two processes to improve the formability of aluminum alloys: 1. By improving the The final rolling temperature of the material can be increased to improve the formability by increasing the degree of recrystallization, but this process will reduce the strength of the aluminum alloy hot-rolled sheet an...

AI Technical Summary

Problems solved by technology

[0004] The recrystallization temperature of aluminum alloy hot-rolled coils is generally above 300°C, and the strength of the material is low (close to the fully annealed state), so the state of aluminum alloy hot-rolled strips is generally F state, and there is no requirement for mechanical properties, but if it can be guaranteed In the case of material forming performance, it can also improve the material strength and surface quality, which will greatly increase the service life of the material, reduce the amount of material per unit area, reduce costs and expand other uses

Images